Chair.



E. G. SEBRING.

GHAIR.

APPLIOATION FILED 001:28. 1910.

1,001,3 1 2. Patented Aug. 22, 1911.

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,lUNlllED @lifladltm EMMA G. SEBRlNG, OF NEW YORK, N. Y.

CHAIR.

To all whom it 'may concern:

.3e it known that l, EMMA Gr. SEBRING, a citizen of the United States of America, and residing in the city, county, and State of New York, have invented a certain new and Improved Chair, of which the following is a specification.

My invention relates to chairs and the particular object of iny invention is to pro vide a hygienic and anatomically correct chair for school rooin or other use.

ln the accompanying drawings, Figi'lre l is a rear elevation of a chair embodying iny invention; Fig. 2 is a vertical cross section on the line 2-2, Fig. l; Fig. 3 is a perspective view of the chair; Fig. t is a side elevation partially broken away, of a suit able clanip; and Fig. 5 is a horizontal sec tion through one of the uprights showing the action of the clamp.

The usual school chair has a concaved shoulder panel of greater width than the shoulders of the child for whom it is designed and frequently reaching` only to a point below the shoulder blades. rl'his back is carried by a seat provided with a central threaded shaft which screws into a stationary pedestal fast to the floor. In such a chair it is practically impossible for a child to assuine a hygienically correct sitting posture for the various occupations, e. g., reading, writing, drawing, etc., which school rooin activities ordinarily necessitate.

Correct sitting posture involves the nuovenient of the trunk backward, forward and sidewise on the hip joints; a straight spine supported just below the waist and at the shoulder blades, elsewhere free, and held very nearly at right angles with the thighs; square shoulders, erect chest and feet resting square on the floor.

lhe present chair has been devised and designed with the distinct purpose of inviting, if not compelling, a correct sitting posture. To this end the chair is so constructed that the only comfortable position when sitting tl'ierein the correct sitting position, and when this position is taken the chair is perfectly comfortable.

will be noted upon reference to the accompanying drawings, the uprights 10 and 11 are relatively close together and practically straight. The crosspieces in the forni of slats 12 and 13 lie substantially in the saine plane, the upper one being sta tionary and slightly inclined backward,

Specification of Letters Patent.

Application filed October 28, 1910.

)Patented Aug'. 22, 1911.

serial No. 589,568.

and the lower one being' vertically adjustable. Any suitable device n'iay be employed to secure the lattel' in its adjusted position. As shown, the nprights are channelled at Ylet; to receive the ends of the crosspiece l2 which carries a can] operated clamp 15 of well known constriution. d

The seat lt' is preferably shaped to the thighs as shown, and the forward uprights 1.7 and .'18 are spaced apart farther than the rear uprights so as to provide a substantial base and prevent tipping. lhc broad front brace llt) is placed high enough to (liseourage hooking the foot over its upper edge, while the absence of a central pedestal. prevents the con'nnon twining of the feet around such a support beneath the seat and the feet are therefore kept forward.

lfroin the above it will be seen that the objects sought to be attained aref aecomplished. rlhe back of the chair is straight and very nearly at right angles to the seat, thus holdingl the sitter-'s back erect. The back is open at the base, thus allowing` the base of the spine to be 'pushed well back in the seat and giving it perl'eet jl'reedoin. '.lhe back of the chair has two points of supljiort, a fixed upper slat at the level of the shoulder blade, and an adjustable lower slat which, by reason of its adjustability, inay be inade to support the sitters back at the proper point. lhe back ol. the chair both narrow and straight allowingl the shoulders to be square and avoiding all rounding of the shoulders` constaluent upon the use of a eoncaved back. This ability to keep the shoulder square is greatly helped by the fact that in iny chair the width olf the chair back at the upper crosspieee is narrower' than the nornlal width of the shoulders of any user :for whoin the chair designed. Furtherinore the chair as a whole is lnovable and may be placed at varying dist ance itroni the desk, thus allowing froci-loin of niovenient at the .hips and permitting necessary adjustnient of distance :frein the desk for various kinds of work and for people of ditl'erent sizes.

Obviously the chair while designed particularly for school rooin use, inay be elnployed where desired.

l claiin as niy invention:-

A. chair7 having an approxiinately vertical back, connn'ising in n'ights with a stationary upper crosspieee in substantially the saine plane, forming a bearing for the ltlt) shoulders, narrower than the normal width In testimony whereof I have signed iny' of the shoulders of a user for whom the name to this specification, in the presence 10 chair is designed, in combination with a of t-wo subscribing witnesses.

lower vertically adjustable orosspiece in a proximately the same plane as the nppr EMMA G' SEBRING orosspiece and means for securing this ad- Witnesses:

justable cross-piece in its adjusted position, JOHN L. ROGERS,

substantially as described. ROBT. C. HARDING.

Copies of this patent may be o'ptained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

